amurcanov
34 lines
561 B
Go
34 lines
561 B
Go
// SPDX-License-Identifier: MIT
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package main
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import (
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"crypto/sha256"
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"errors"
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"fmt"
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"io"
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"golang.org/x/crypto/hkdf"
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)
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const (
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wrapKeyLen = 32
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)
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func deriveWrapKey(password string) ([]byte, error) {
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if password == "" {
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return nil, errors.New("empty password")
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}
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key := make([]byte, wrapKeyLen)
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reader := hkdf.New(
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sha256.New,
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[]byte(password),
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[]byte("WDTT-WRAP-v1"),
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[]byte("rtp-obfs/chacha20poly1305"),
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)
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if _, err := io.ReadFull(reader, key); err != nil {
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return nil, fmt.Errorf("derive wrap key: %w", err)
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}
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return key, nil
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}
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